JP3398546B2 - Flat coreless geared motor without output shaft - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a flat coreless geared motor for driving a pickup used in a portable mini disk device and the like, and in particular, eliminates an output shaft to reduce the thickness. About things. 2. Description of the Related Art Conventionally, as a geared motor for driving a pickup used in a portable mini disk device, a worm gear or the like is attached to an output shaft of a small cylindrical DC motor, and the output is increased through a flat gear. There are things that take out. However, with such a configuration, it is difficult to reduce the thickness, and there is a limit in terms of power in making a small cylindrical DC motor thinner, and it is unlikely to be realized. [0003] Therefore, it is conceivable to provide a so-called flat geared motor having a flat motor body. That is, as shown in FIG. 3, a pinion gear P is attached to an output shaft of a flat coreless motor m having a thickness of about 4 mm. Normally, such pinion gears are made of polyacetal resin in order to reduce mechanical noise, and have to be thinned to about 0.5 mm in order to flatten the thickness. is there. If such a pinion gear is provided, there is a limit to the reduction in thickness, and the cost of the pinion gear also becomes a problem. One object of the present invention is to provide an extremely thin flat coreless geared motor, and another object is to provide a flat coreless geared motor which is advantageous in cost. [0005] The above-mentioned problems can be solved by removing the output shaft and the pinion and integrating the gear portion with the rotor so that the thickness of the gear portion can be ignored. By doing so, the thickness can be made extremely thin, the cost of the pinion gear can be raised, and a gear motor can be formed by connecting another spur gear to a gear part protruding outward from the window. [0006] As one embodiment of the present invention, a housing (H) comprising a case (1) and a bracket (2) and a housing (H) comprising: A flat coreless rotor (3) housed via a shaft (S), the flat coreless rotor having a gear portion (3b) provided on an outer peripheral portion thereof, and having the gear portion provided on a side portion of the housing. A flat coreless geared motor without an output shaft that protrudes radially outward from a window (M) so that the shaft does not protrude from a housing, wherein the rotor (3) has a plurality of air-core electric motors integrated with a gear portion. Child coil (3
has a), in order to prevent the foreign matter into the interior from the window enters the gear portion is formed sufficiently smaller than the thickness of the rotor, the housing at the gear portion in a portion of the window A side portion of the housing is cut into the thickness of the rotor so as to have a gap above and below, and the housing and a window provided in the housing,
It is preferable that a labyrinth is constituted by the thickness of the gear portion and the rotor . This way,
A labyrinth can be easily formed, and a rotation defect due to entry of foreign matter can be prevented. [0007] According to a second aspect of the present invention, the low
The shaft (S) that supports the shaft has its base end fixed to the bracket.
And the other end is fitted into the case.
The rotor rotates at the center bearing part so that
Is fixed to part of the housing
Things are good. In this case, the rotor is mounted on the housing.
No additional bearings are required, assembling is simple and cost
This is advantageous in terms of efficiency. Next, the structure of an embodiment of the present invention will be described with reference to FIG. In the figure, a housing H is composed of a shallow dish-shaped case 1 and an end bracket 2 attached to an opening edge of the case 1, and a part of a side periphery of the case 1 is cut out and arranged on an outer periphery of the end bracket 2. A window M is constituted by the set-up section 2a. The shaft S is fixed to the inside of the housing H by being press-fitted into the burring portion 2b raised from the center of the end bracket 2. On the shaft S, a flat rotor 3 integrally formed with an air-core armature coil 3a and a gear portion 3b disposed on the outer periphery with a resin having good slidability is rotatably supported. This rotor 3 is an end bracket 2
The gear portion 3b is formed to be thinner than the rotor 3 and is provided with a predetermined gap between the ring-shaped magnet 4 disposed in the case 1 and the ceiling portion of the case 1.
It protrudes more laterally. Therefore, when viewed from the side of the window M, no air gap can be seen, and a labyrinth structure can be obtained here as foreign matter intrusion prevention means. Further, a flat commutator 5 made of a printed wiring board is attached to the ring magnet side of the rotor 3, and the base end of the flat commutator 5 is connected to the end bracket 2 via a brush base 6 made of a flexible board. The pair of implanted flat sliding brushes 7 in the axial direction is 90
It is slid in contact at an open angle. FIG. 2 is a side view of a main part showing the structure of another embodiment of the present invention, in which a flexible film 8 such as a fluororesin is disposed in the window M as means for preventing foreign matter from entering. . Grease may be further attached to the film 8. By doing so, the brake loss is small, and it is more effective to prevent foreign matter from entering.
The thickness of b may be the same. In the above embodiment, the fixed shaft type has been described. However, the shaft may be rotatably supported via shafts integrated with the rotor by bearings provided at both ends of the case and the end bracket. According to the present invention, the gear portion is provided on the outer peripheral portion of the flat coreless rotor as described above, and the gear portion protrudes outward and outward from a window provided in the housing. The thickness of the motor can be neglected, and an extremely thin flat coreless geared motor can be provided. To prevent foreign matter from entering the window, make the gear part thicker than the rotor.
Thin the part of the housing at the window (M)
The rabbi is cut into the thickness of the rotor with
Construct a rinse or add a flexible film to the window (M)
Since (8) is provided, there is no possibility of causing a trouble at the time of rotation due to entry of foreign matter . Since the output shaft does not need to protrude out of the housing, a configuration can be adopted in which the shaft can be fixed, which is advantageous in cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a main part of an embodiment of a flat coreless geared motor without an output shaft according to the present invention. FIG. 2 is a side view of a main part of another embodiment of the motor. FIG. 3 is a side view of a conventional flat coreless geared motor. [Description of Signs] H housing 1 case 2 end bracket 2a rising portion 2b disposed on the outer periphery of end bracket 2 burring portion M window S shaft 3 flat rotor 3a air-core armature coil 3b gear portion 4 ring-shaped magnet 5 printing A flat plate commutator 6 composed of a wiring board 6 A brush base 7 A pair of axially sliding contact type flat brushes 8 Flexible film such as fluororesin

Claims (1)

(1) A housing (H) including a case (1) and a bracket (2), and a flat coreless rotor (3) stored in the housing via a shaft (S). ), And the flat coreless rotor has a gear portion (3
b) is provided, wherein the gear portion protrudes radially outward from a window (M) provided on a side portion of the housing to prevent the shaft from protruding from the housing. , the rotor (3) has a plurality of air-core armature coils integral with the gear portion (3a), in order to prevent the foreign matter into the interior from the window enters the gear unit thickness of the rotor are more fully thin, the housing causes bite into the sides of the housing so as to be within the thickness of the rotor so as to have a gap up and down at the gear portion in a portion of the window, the housings
Ring, the window provided in this housing, the gear section and
And a flat coreless geared motor without an output shaft in which a labyrinth is formed by the thickness of the rotor .